[issue7942] Inconsistent error types/messages for __len__ between old and new-style classes

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

Interestingly, this (len returning something larger than ssize_t) has not been fixed in python3.

On the other hand, I still think the new-style message is better.  Yes, it is an implementation detail of CPython, but that is exactly the error being reported.  Another implementation might successfully return the value.

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